Malicious PDF — malware analysis report

Static analysis result for SHA-256 928b8f4e0f78df88…

MALICIOUS

PDF

71.7 KB Created: 2021-02-12 05:32:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f8e99a740b1858a7f36909e619fed1ca SHA-1: 00c83092ff5e32194ba7466dc58811ebdedfa97f SHA-256: 928b8f4e0f78df88db8b7e12049b427e48d9e8b19037279d8cf37751769db54e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or malware distribution attempt. It contains a large number of external links, suggesting it is part of a link farm designed to redirect users to potentially harmful websites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/wix?keyword=lethal+alleles+example PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412896/normal_600e21e8b8301.pdfIn PDF document text
    • http://brumbum3.xyz/mujercitas_libro_completoq9owj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450259/normal_5ffab17520ab8.pdfIn PDF document text
    • https://tetufimaburovi.weebly.com/uploads/1/3/4/0/134098130/18e1c40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491414/normal_6002a3530014d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369336/normal_5fe4b2b47da12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488569/normal_5fe79c41de42c.pdfIn PDF document text
    • https://zubisixoligifi.weebly.com/uploads/1/3/4/4/134479514/6275744.pdfIn PDF document text
    • https://bagekitavaseb.weebly.com/uploads/1/3/1/0/131070055/749990.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413587/normal_5fe0c802b9e5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446645/normal_5fe1f367ac440.pdfIn PDF document text
    • https://kodirovotosin.weebly.com/uploads/1/3/2/8/132814250/3c1e7325553fa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487625/normal_601c5e41d1837.pdfIn PDF document text
    • http://goldstein.berlin/79441547137jbuj2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485818/normal_5fcd0d145c043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476936/normal_5feb043e31b9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_5fe709d0a806d.pdfIn PDF document text
    • http://dreamingdeveloper.com/32376239317eurfr.pdfIn PDF document text
    • https://fugebigejajifad.weebly.com/uploads/1/3/1/4/131406613/zamijaretoselalapov.pdfIn PDF document text
    • http://good-production9.site/asociacion_protectora_de_animalesayfc3.pdfIn PDF document text
    • https://lejalebenepuk.weebly.com/uploads/1/3/0/7/130776022/nikalaxusij-badonutijolade-fofotedalakijam-wirogijo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 4972 bytes
SHA-256: 864e5449f4821e38b4cf3c222975dbf2aea52b8141e09f2689de8700b8b98811
font_01_sfnt_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 9992 bytes
SHA-256: 25870faaf855a509a3e8ea6e89ab972c505a5fcfaba810dd4ba0542a38d9f397

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